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. 2017 Apr 28;8:15172. doi: 10.1038/ncomms15172

Figure 1. Burkholderia gladioli symbionts are transmitted vertically via egg smearing in Lagria villosabeetles.

Figure 1

(a,d) Adult females carry the symbionts within two pairs of accessory glands associated with the reproductive system as confirmed by FISH on cross-sections of a female reproductive system (inset). (b,e) Host eggs are covered with a secretion containing Burkholderia bacteria, as revealed by FISH on an egg wash. (c,f) The symbionts colonize invaginations of the cuticle that result in three dorsal compartments represented in red in a three-dimensional (3D) reconstruction of an L. hirta larva. The Burkholderia symbionts were localized by FISH in a cross-section of an L. villosa larva (inset). FISH pictures show Burkholderia-specific staining in red (Burk16S_Cy3), general eubacterial staining in green (EUB338_Cy5), the overlap of these two in yellow and host cell nuclei in blue (DAPI). Scale bars, 20 μm (d) and 50 μm (e,f).